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I'll run a log today, but looking at the tune I have the DFCO Cylair Enable/Disable tables modified. I'm assuming this is causing the rapid swings I'm seeing off throttle. I put this together so long...

I'm trying to use my MPVI3 to disable the post o2 tests on my offroad truck but I can't seem to find the option anywhere. It's causing my wide band to swing when letting off the throttle. Am I...

I have a 2012 2500 LML that has been tuned with EFI Live. I'm trying to read the current tune with HPT but only get the option to download a stock tune from the internet. Am I missing something or...

I've attached my tune for my 2009 Sierra 4.8 4wd for 91 octane. It's been trial and error for me. I'm learning as I go.

Looks like I was logging the wrong throttle PID. Strange I'm getting three different numbers.
Any idea on the cyl airmass reading?

I just noticed that myself. I did a few short WOT pulls. Looking back at previous logs it's registering up to 87% pedal on the floor. Maybe I'm logging too many things at once and it's slowing down...

Hey guys,

I'm trying to do some initial logs on my truck and I'm curious if I'm logging the proper cylinder airmass PID. I've seen sample logs running up to 1g, but my logs seem to top out at...

What's involved with correcting the injector data? I'm using stock 29.6 @ 58 injectors and my Injector Flow Rate vs. Pressure Delta matches. Do I just follow by verifying the MAF and VE tables?

Thanks! Could you please explain the purpose of lowering the voltage on the Rich/Lean vs. Airflow tables?

130137

Hi Guys,

New to HP Tuners. Just read my stock 2009 Sierra 1500 4.8 and found a discrepancy in gear ratios. Just wondering if anyone has encountered this before. I'm assuming this would affect the...

I'll have to check the video out. Maybe I'm better off leaving the trans alone. It's weird the ECM is set for 3.42 but the TCM is set for 3.73 According to my VIN the truck has 3.42 gears.

Any further inputs required? I selected shift slope and entered my tire size.

Hi all,

I just purchased HP Tuners to try and learn on my bone stock 2009 Sierra 4.8. I've started by reducing the engine TM and lowering my PE to 3500rpm @ 60% throttle. I ran a log this morning...